Citation: Dong-dong Peng, Ran-xing Nancy Li, Chi-hang Lam, Ophelia K. C. Tsui. TWO-LAYER MODEL DESCRIPTION OF POLYMER THIN FILM DYNAMICS[J]. Chinese Journal of Polymer Science, ;2013, 31(1): 12-20. doi: 10.1007/s10118-013-1207-x shu

TWO-LAYER MODEL DESCRIPTION OF POLYMER THIN FILM DYNAMICS

Corresponding author: Ophelia K. C. Tsui,
Received Date: 11 July 2012
Revised Date: 24 August 2012

Fund Project: The work was financially supported by the National Science Foundation through the projects DMR-0908651 and DMR-1004648, and HK PolyU through the grant G-U857.

Experiments in the past two decades have shown that the glass transition temperature of polymer films can become noticeably different from that of the bulk when the film thickness is decreased below ca. 100 nm. It is broadly believed that these observations are caused by a nanometer interfacial layer with dynamics faster or slower than that of the bulk. In this paper, we examine how this idea may be realized by using a two-layer model assuming a hydrodynamic coupling between the interfacial layer and the remaining, bulk-like layer in the film. Illustrative examples will be given showing how the two-layer model is applied to the viscosity measurements of polystyrene and polymethylmethacrylate films supported by silicon oxide, where divergent thickness dependences are observed.
- Polymer films
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